Lantern

Peer into your requests.

Introduction

Lantern is an open-source debugging proxy (similar to Fiddler/Charles Proxy) that is written in Go and can be hosted on a server. It uses the Chrome DevTools Inspector as a frontend UI, providing developers with a familiar interface for inspecting their network traffic.

Features

• Open Source (MIT License)
• Familiar Devtools UI
• SSL/HTTPS Interception
• Hostable MITM Proxy (run on a server)
• Request/Responses persist between sessions.
• Dockerized
• Generates a .mobileconfig file for use with macOS and iOS

Setup

Lantern is designed to run via Docker, and as such we've created a docker-compose.yml file to get you started.

docker-compose up

Usage

After you've started up Lantern, there are 3 important URL's you'll want to be familiar with:

• http://localhost:8080 is the URL for the Lantern WebUI. From here you can view any request/response that are sent through the proxy
• http://localhost:8081 is the HTTP Proxy URL. On your test device, you'll want to configure a HTTP proxy. In a standard deployment, this will usually be assigned to a easy-to-remember URL that you can enter into your various devices: http://proxy.corp.example.com:8081
• http://localhost:5050 is the URL for the (optional) Database Admin UI. From here you can view the content of the Lantern DB, where network traffic is stored.
  • database name: lantern
  • username: lantern
  • password: lantern-password

Here's a quick test you can run to ensure that everything is working correctly:

curl -k -x localhost:8081 https://www.google.com

Please note, the -k flag forces curl to ignore SSL certificates. If you're interested in intercepting SSL traffic (and removing the -k flag), you'll want to check the SSL_INTERCEPTION.md file in the docs directory.

TroubleShooting & Useful Tools

TODO:

• Documentation
  • [-] README.md documentation.
• Proxy Code
  • SSL interception
  • better error handling.
  • STRETCH live request interception/hijacking & modification.
• Frontend/Websocket Code

  • Add links to the mobileprofile & CA certificate in the Web UI

  • backfill requests when new Websocket connection opened

  • command responses should be separated from event responses.

  • reorganize code, cleanup of event generation

  • Use embedded version of Devtools UI.

  • Add support for HAR archive.

  • variables for connection strings.

  • better error handling.

  • Ability to delete/remove recordings (without wiping the DB)

    UI.panels.network._networkLogView._dataGrid.setRowContextMenuCallback(console.log)

  • [-] Hide tabs that we do not support

    • https://github.com/ChromeDevTools/devtools-frontend/blob/master/front_end/ui/View.js#L798-L806

    • var viewid = UI.viewManager._views.get('network').viewId()
      
      UI.viewManager._views.delete(viewid)
      UI.inspectorView._tabbedPane.closeTab(viewid)
      
      

  • Devtools Theme

    • https://chrome.google.com/webstore/detail/devtools-author/egfhcfdfnajldliefpdoaojgahefjhhi
    • https://chrome.google.com/webstore/detail/devtools-theme-zero-dark/bomhdjeadceaggdgfoefmpeafkjhegbo

  • STRETCH live request interception/hijacking & modification.

License

MIT

Contributing

Please consider contributing by opening a pull request.

References

• Logo: Lantern by zidney

Web Frontend

• https://chromedevtools.github.io/devtools-protocol/
• https://github.com/ChromeDevTools
• https://github.com/christian-bromann/devtools-backend
• https://github.com/ChromeDevTools/awesome-chrome-devtools
• https://github.com/ChromeDevTools/devtools-frontend/issues/95
• https://github.com/chromedp/cdproto-gen
• https://blog.hqcodeshop.fi/archives/402-iPhone-Mobile-Profile-for-a-new-CA-root-certificate-Case-CAcert.org.html
• https://www.howtogeek.com/253325/how-to-create-an-ios-configuration-profile-and-alter-hidden-settings/
• https://mdzlog.alcor.net/2012/11/15/decoding-a-mobileconfig-file-containing-a-cisco-ipsec-vpn-configuration/
• https://stackoverflow.com/questions/16727038/how-to-make-mobileconfig-file-on-ios-device
• https://developer.apple.com/library/archive/documentation/NetworkingInternet/Conceptual/iPhoneOTAConfiguration/Introduction/Introduction.html
• https://github.com/mritd/strongswan/blob/master/generate-mobileconfig.sh
• https://github.com/ChromeDevTools/devtools-protocol/tree/master/pdl
• https://github.com/ChromeDevTools/devtools-frontend
• https://bit.ly/devtools-contribution-guide
• https://groups.google.com/forum/#!forum/google-chrome-developer-tools
• https://twitter.com/DevToolsCommits
• https://gist.github.com/vbsessa/e337d0add70a71861b8c580d5e16996e

•   src="https://chrome-devtools-frontend.appspot.com/serve_file/@1c32c539ce0065a41cb79da7bfcd2c71af1afe62/devtools_app.html?ws=localhost:8081/ws"
    src="https://chrome-devtools-frontend.appspot.com/serve_file/@1c32c539ce0065a41cb79da7bfcd2c71af1afe62/inspector.html?ws=localhost:9000/ws&remoteFrontend=true">
    src="https://chrome-devtools-frontend.appspot.com/serve_rev/@195284/devtools.html?ws=localhost:9000/ws"
  
  
    /Applications/Google\ Chrome.app/Contents/MacOS/Google\ Chrome --remote-debugging-port=9222 --no-first-run --no-default-browser-check --user-data-dir=$(mktemp -d -t 'chrome-remote_data_dir')
    /Applications/Google\ Chrome.app/Contents/MacOS/Google\ Chrome --user-data-dir=chrome-remote_data_dir
  

API/Websockets

• https://github.com/ChromeDevTools/awesome-chrome-devtools#chrome-devtools-protocol
• https://medium.freecodecamp.org/million-websockets-and-go-cc58418460bb
• https://scotch.io/bar-talk/build-a-realtime-chat-server-with-go-and-websockets
• https://github.com/chromedp/cdproto
• https://godoc.org/github.com/chromedp/cdproto
• https://gobyexample.com/non-blocking-channel-operations
• https://github.com/kdzwinel/betwixt/blob/master/src/main.js
• https://chromedevtools.github.io/devtools-protocol/tot/Network
• https://medium.com/rungo/anatomy-of-channels-in-go-concurrency-in-go-1ec336086adb

Database

• http://coussej.github.io/2015/09/15/Listening-to-generic-JSON-notifications-from-PostgreSQL-in-Go/

Proxy

• https://github.com/elazarl/goproxy
• https://gist.github.com/Soulou/6048212
• https://github.com/docker/go-docker/blob/master/hijack.go
• https://stackoverflow.com/questions/23812330/go-hijack-client-connection
• https://golang.org/pkg/net/http/httptest/#NewRequest
• https://medium.com/@mlowicki/http-s-proxy-in-golang-in-less-than-100-lines-of-code-6a51c2f2c38c
• https://medium.com/@mlowicki/https-proxies-support-in-go-1-10-b956fb501d6bv
• https://github.com/sethgrid/fakettp
• https://github.com/go-httpproxy/httpproxy
• http://speakmy.name/2014/07/29/http-request-debugging-in-go/
• https://github.com/roglew/pappy-proxy/tree/master/pappyproxy/interface/repeater
• elazarl/goproxy#9
• curl -v -L -x http://localhost:8082 -p --proxy-insecure -k https://www.example.com

Install Certificates

• https://knowledge.digicert.com/solution/SO13734.html